Reincarnation?
Yes, reincarnation.
"The soul that reincarnates as a human for the first time has a right, and that is to choose to reincarnate with memories."
"So the theory of reincarnation was very effective a long time ago. As for now - haha, as you can see, more realistic science is more palatable."
"Actually, there aren't that many first reincarnations, but there are too many souls that have gone through purification. As for purification, that's a bit much, so I won't explain..."
"The reason for this is related to nature. Nature is the most generous and stingy. It is difficult to understand."
"Anyway, how do you choose? Die as a fool or be a sensible person in the next life?"